TERMINOLOGY

Here are some important terms to help you when discussing your heating, cooling or ventilation issue.

AFUE%
Annual Fuel Utilization Efficiency. This is a measure of a furnace's heating efficiency. The higher the AFUE% is, the more efficient the product is. The government's regulated minimum AFUE rating for furnaces is 78%.

Air Handler
This is the portion of the central air conditioning or heat pump system that moves heated or cooled air throughout a home's ductwork. In some systems a furnace handles this function.

Balance Point
An outdoor temperature, usually between 30 degree and 45 degree F, at which a heat pump's output exactly equals the heating needs of the home. Below the balance point, supplementary electric resistance heat is needed to maintain indoor comfort.

BTU
This is British Thermal Unit. The amount of heat required to raise the temperature of one pound of water (about one pint) by one degree F.

Evaporator Coil
The portion of a heat pump or central air conditioning system that is located in the home and functions as the heat transfer point for warming or cooling indoor air.

Heat Pump
An air conditioner with a valve that allows it to alternate between heating and cooling.

Heat Source
A body of air or liquid from which heat is collected. The air outside the home is used as the heat source during the heating cycle.

HSPF
Heating Seasonal Performance Factor. This is a measure of a heat pump's heating efficiency. The higher the HSPF, the more efficient the product is.

SEER
Seasonal Energy Efficiency Ratio. A measure of an air conditioner's cooling efficiency, The higher the SEER, the more efficient the product is.

Split System
A heat pump or central air conditioning system with components located both inside and outside the home. The most common design for home use.